HELP PLS y=x+4 y=3x-4
2 answers:
Answer:
Step-by-step explanation:
Hey, I posted this yesterday in the comments of an answer, but since that answer got deleted, here it is again:
First, we need to solve for x. Since these equations are both equal to y, they're also equal to each other, so we can combine them to get . Then, we add 4 to both sides to get
, then subtract x from both sides and get
. Then, if we divide both sides by 2, we get
.
Now that we have x, we can plug it into one of the equations and solve for y. I chose to plug it into the first one. So, now we have , which simplifies to
.
Combining those two solutions, we get our coordinate point: .
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Answer: 0.9996
Step-by-step explanation:
Given : The monthly electrical utility bills of all customers for the Far East Power and Light Company are known to be normally distributed with a mean
Standard deviation :
Sample size : n=100
Let X be the random variable that represents the electricity utility bill for a randomly selected month .
z-score :
For X = $75.00
Now, the probability that the average bill for those sampled will exceed $75.00 will be :-
Hence, the probability that the average bill for those sampled will exceed $75.00 =0.9996